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Wingtip vortices from a preceding B-737 are forming the condensation trail into what appear to be smoke rings. Atmospheric conditions have to be just right for this phenomenon to occur.
Smoke Rings by airventure.
...the smoke forms with the wingtip vortices and eventaully forms these circles. As you can see the T-28 was able to fly through one of them!
Contrails or vapour trails are condensation trails and artificial cirrus clouds made by the exhaust of aircraft engines or wingtip vortices which precipitate a stream of tiny ice crystals in moist, frigid upper air. Being composed of water, the visible white streams are not, in and of themselves, air pollution. However, contrails generated by engine exhaust are inevitably linked with typical fuel combustion pollutants. Contrails might also be considered visual pollution.
Originally posted by tomra
I´m curious, what made you post this in the UFO/aliens forum section?
Originally posted by ReelView
That is strange. Twice while working in Scottsdale Arizona I saw a totally clear sky except for rays of clouds fanned out coming from a single point in the direction of Phoenix. It looked as if some generator machine off in that direction had create the clouds Lots of strange stuff in the sky.